Honing device



4 Sheets--Sheet l May 22, 1945. J. AsuNNEN HONING DEVICE Filed oct. 22, 1942 5N N M 5% Nmu May 22, 1945. y

J. suNNEN HONING DEVICE Filed oct. 22, 1942 4 sneet'sfsneet 2j May 22, 1945. 4 J. sUNNE v HQNING DEVICE Filed oct. 22, 1942 4 Sheets-Sheet 5 I Josephumzefz,

`May 22,1945. .SUNNEN i "2,376,850

HONING DEVICE l y Filked oct.' v22, 1942 4 sheets-sheet 4 Patented May 22, 1945 f UNITED; STATES PATENT OFFICE i l nasvasojf" HONINGDELYIG Joseph Sunnen, Clayton, Mo:r l Application oetber`2a194j2, sepialneitzpsz l 11 claims.- (501;13514184Q3) The main object of this invention is to construct a honing arbor or mandrel with means for -substantially eliminating the possibility of vibration or chattering during the honing operation, whereby greater perfection is obtained inthe nishedv surface;

Another object resides in the v provision of' a removable bearing shoe for the honing arbor or mandrel so constructed and arranged as to protect the body of the hone'or mandrel against wear due to contact with the Work and to provide ,means whereby an adjustment of the bearing shoe can be madepto compensate for wearlor Ato permit the use `of thevhlone or' arborwith work of different diameter.- f v '1 vInasmuch as the coeicientof friction of-an abrasive stone in Yoperativeengagement with its work is greater thanfthat; of ya corresponding wear plate in engagement with .the; same work, it is essential'that the abrasive stone and ,wear 4or bearingfaces be arranged circumferentially of la mandreLin a predetermined; manner to ycompensate for this differential.,It is therefore `an object of the present-.invention .to so locatethe wear or bearing shoe circumferentiallyvl onthe mandrel and with respectto .the hone faceasto dulycompensate for this difference inithegycoeilicient of .friction whereby fmaximumremciency in the uniform distribution-ofradial forces is obtained' to increase;accuracywand` eliminate undesirable vibration. i l

l A furtherobject ofrthelinventionfcomprehends the use of means4 forfpositively seating ycertain engaging surfaces betweenthewear plate andthe hone, so as`to eliminate the possibility of `mise` alignment between these parts. l v 1 l Other objects reside in the arrangement offthe removable wear plate which so constructed .and arranged. as to be laterally'offsetl from an axial plane l extending mediallythroughl the abrading-surface, the -oifset being opposed tothe direction ofthe load created by the` engagement of the rotating abrading surface with the work, andbeing in direct proportion to the area 'of the abrading surface in Workingr engagementand the friction present byA virtue of the Athrust between the abrading surface and the work; to` secure the l wear. plate with at least one Vfits surfaces biased into-engagement with thehone body and :tomake yprovision* for eliminating all lost motion'between the hone orwthe hone sections -Aandlitor their manipulative parts. f t

Other objects will more lclearly hereinafter appear by referenceLto the accompanying'v drawings l and claims `forming'apart ofth'isfspecincation, Y

.present4 illustration as ybeing of cylindrlcalform,

l yFigure lisa top plan View; p l l n n Figure 2 is a `parallel perspective with the bear-A ringtshoes in position; l f Y I vstopi member of `Figure 10;

bar;

and `wherein like characters of' references designate corresponding parts throughout the several l views, in which n r l Figure 3 is a longltudinawvertical section; Figure4 is an end view; p Y F'gure 5` isl asection on line. 5f5A of Figure 3;

Figure-6 isa section-on lineS-G Io f .Figure 3; Figure 7 is` a sectionv on linell of Figure 3; 1 p Figure Bis atop plan view ofthe mandrel with thehones and; actuating bar removed;

Figure 9 isaparallel'perspective` of the man# ,drel with thebearingshoes removed; v c

, .Figure 10 is a top plan View of the convertible n stoplmember; l l. f

Figure 11 is a side,elevation of stop member; of Figure 10;

, Figure 12 is an end elevation "of the convertible Figure `13` is ,a top plan viewof one of the bearing shoes;

Figure 14,15 a longitudinalsection of thev beare planview of the actuating bar y Figure 20 isa top plan Iview of the invention shown inlFigurelQ; f, l l l y Figure 21 is a side elevation of a modified -type of actuatingbariused in the invention of "Figure 19.; l f a -v Figure 22 is atop planviewy of the` actuating ,bari of Figurer21; and

'l Figure 23 is a transverse section on line 23--23 of Figure21.

The mandrel or arbor body is shown in the the length and. diameter being determined by the nature of the4 work for .which ythe assemblyr is designed; Asili` my# Patent Ne-2,350,969, the

bodyof they device is formed at ,one end at 2 with the usuai head portionqwmch is inserted inthe chuck end of thespindle ofva machine of any suitable type, such .as lllustratedfdn my -formerPaterit No. 2,070,381.' A longltudlnallrecess 3 is formed throughout lthe length ofthe the y convertible lithe honing operation.

Ltutionof, new shoes `is facilitated by theruse ofl .cylindricalwailfwhrcheisatmbefhoned; Theron,-

fing'f. elements are expanded a .predetermined dista'nce repriesentingthefsamount of surfaceto be removed.` To 'provide for this lhoning f movement,

and the working surfacez'constitute a1 bearing whichis .subject to` wear; and,` thereforaysubject vto modification to/compnsate for the `wear. As one, l of 'theffeatures `oi the f present invention, rif

:is contemplated that .lthe' wearing/surfaces of the Y arbor .shall i be.I sol-:positioned .with respect to the honing surfacesthat theyl will'receive the movevmentor thnustfrom "the .honing operation at a .medial point so that thewear ofthe bearingfaces `will be uniformly.distributedand.sothat any lat- Aeraluvibration which might result from an'im- -proper alignmentA of the bearingif'aces will be compensated-for and a more'perfect face-.produced by :.1 :The foregoing is accomplished lin thepresent instance by providing bearing or wear-shoes `which aredetachably `fixed to themandrel body to vperi, `mit'an interchange of this part and adjustmentto laccommodate i wear,- the :location ofthe bearing yshoes .being so determinedfthat the forces created by engagement-of the honewithfthe work will evenlyy dispersed throughout vthe bearing area.; The mandrel body-inthe `present illustration is formed with longitudinally? extending circumferentially spaced `shoulders 50 and ,5Il for therel ception'of the .bearing shoeorwear plate (Figures 13 to 16, inclusive) ,the latterrbeingiprovided with;V

desirable seating `of thegparts 'may be .obtained` by'a slight `offsetoi the shoe'openingwith `respecty to the mandrelzopening, `say \.010,of `aninch vto: jam opposedy surfaces .y together. l This l is arcuate bearing faces 53 sodisposed `that a radial plane extending fmediallirv of the same. and axially mandrel ismounted with affixedcenterhof rotation, the working center shifting with'the wear of the bearing shoes and the hone elements.

Itv will be noticedlfromv Figure 6 that avertical vplane extending axially of themandrelbody does notabiseci; thehonereceivingvrecess; the latter -being slightly offset' to assist `inf the distribution of the force` developed by the frictional engagel f ment of the hones with the work, andiit will be apparent Athat: thev coemcient `of .friction between l-the'hone andi the `work will beafvarlablefactor vwhich may slightly alter theA disposal ofthev bear- -ing faces withfrespect'tolthe-plane of the working face of the hone elements. The speed of rotation, type. of abrasive material,A pressure between. the

VworkA and thelhoning .surface and other` -factors nmayalso enter into the relative arrangement of lthevarious parts.. i f

The bea-ring shoesfinclude the parallel`legs-54` formedv withthe spaced seating surfaces 55 `which yin assemblyabut the shoulders 50 of the mandrel body. `It is lintended that adjustment. of the, bearing` shoes :to compensate forwear -or to permit; the use of ,the `mandrel in work of varied diameter be accomplishedby the ;usel offshims .5B (Fig. 23) interposed: between the shoes and the mandrel andthis ladjustment `or the substithe radial movement of theiasteners `t'a'l-.ofpwhich severalare shown in andinto the-mandrelbody and in `rthis -connec- `tion:` it. has y been found that aA more positive and lshown best Figs. 5 and 16 in which guresthe opening 58 is. offset,v with respect `to the opening ,59 in the mandrel vso that the screw51 urges the abutting` face 59 of the bearing shoe against the face 60 of.the mandrel-To preventdisplacement of the wear plates or bearing members `the mandrel is. formed with `a plurality of equally spaced projections 6| along its under surface and' `intermediate `the shoulders '50., These projections 6| seatnin depressions 62 defined yby., the

transverseribs 6.3in the inner concave faces'of lthe bearingshoes.

It `Will be noted that the end ribs 63of eachshoe larefonly onehalf as `thick as the intermediate ribs so `that in assembly abutting ',end ribs of a pair `of shoes will snugly seat between' a pair of projections 6I. The screw openings for fastening the shoes to the mandrel extend through the projections 5| and thus a more substantial connection -is possible. The bearing shoes are recessed lengthwise, intermediate the bearingportions 53' to accommodate the head of the fastening elements andv to limit-the area of the bearing surfaces. The bearingV area is further limited by suitable transverse slots 6,4. which inherently. increase the vradiatingsurface ofthe wear parts. The number of wear shoes used on each mandrel maynot be ofgreat importance except to. permit quick adjustment 0r interchange of parts orto reduce the expense of replacement. The position of :the shoe on the mandrel is important, however, in that it insures a greatly improved iinished surface. 1 i

Itwill'be notedI in Figure 8 that the mandrel is formed with screw opening 33 in the baseloi' :the: honerecess tov permit'A the use ofv vertical screw in fastening the stopy 5in position. The screw opening 33 is to receivey a vertical screw e when the end stop 5 is converted to useA as an inner stop vas shown inFigures 1.9,and 20', although in r'these figures the arrangement ofthe fastening lscrew isshiftedto extend transversely `offthe hone' recess to illustrate a'variation in this con- 'nection i My. invention is adapted to numerous uses, and

one `ofthe Vfeatures thereof is a` provision of" a substitute cam and hone arrangementtwhich makes the device'particularly adapted. to. the `grinding-of holes for a` blind end.` One of ythe l problems in nishing holes ofthe type, which lhave one end closed vor blind, is to provide for the adjustment of the hone without having the ,cam

project' beyond the end` of the arbor, which would,.

of course, prevent the. hone: from extendingto i 'the full depth 'of the hole. r `1 Y It will be understood that the lmachines in which theseihones are operatedisof the-,type shown yin my copending application Serial No. 427,655,v or' my PatentfNo.2,r0'70,381. `In,. these r`machines, the expansion of the hone arbor .is -produced in two stages, the rst being a comparatively 'rapid expansion to the point which iis preset at the -start of the ,honing operation to correspond gtolthe point atwhich thehoning be,-

. hone-,canl be contracted so as toI easily clear the Vhole toy permitv the placing ofthe workin-posi-` i vtion -on thehone arbor and then are expanded quikly Vto ,imposition :at which. :the 110119 Starts ing elements, to permit the use of said arbor in holes of the desired diameter.

4. A honing arbor for use in internal grinding, said arbor including a longitudinally extending hone receiving groove, a removable wear plate for said body constructed and arranged to uniformly receive the thrust created :by the honing operation, and means for securing the Wear plate to the body, said means being biased to urge said wear plate against said body in a direction opposed to the direction of movement of said arbor.

5. In a honing mandrel for use in internal grinding including a body formed with an elongated recess for receiving radially expansible honing elements, a slidable actuating bar for said honing elements, means forlsecuring. the actuat-` ing bar'against radial movement, means at the outer end of the recess for securing the honing elements against longitudinal movement in one direction, and a stop in said recess and spaced inwardly of the inner end of said honing mem-` bers,.and spring means interposed between said stop'and said honing members-for retaining the honing members in compact relation.

6, A honing mandrel for use in internal grinding including a body formed with an elongated recess for receiving radially expansible honingk shoulders elements, longitudinally extending formed on the body ofA said mandrel, said shoulders being circumferentially spaced ,un evenly with respect to they recess, a bearing shoe of arcuate form having its longitudinal marginal edge portions seating on said shoulders, and fastening means 'for said mandrel, said fastening means urging said mandrel laterally to bias the engagement of contacting faces of the mandrel and bearing shoe.

7. A grinding arbor for. use in grinding dead end holes including a body having a longitudinal recess extending to its outer end, a honing element in said recess having the outer extremity of its honing surface flush with the outer end of said arbor, -an actuating element arranged for rectilinear movement in said recess adjacent said provided on said honing element, and means for of its honing surface nush with the outerend of said arbor, an actuating element arranged for,

rectilinear movement in said recess adjacent ksaid 'honing element, said4 actuating element including cam faces Afor cooperation with portions of the honing element and being so constructed r and arranged that the initial movement of the actuating member will resultA in only a restricted movement of said hone. y

9. A grinding arbor for use in grinding dead end holes including a body having'a longitudinal action to provide for discontinuation of the hone movement at a predeterminedk point in its travel.

10. A grinding arbor for use in grinding dead end holes including a body having a longitudinal recess extending to its outer end, a honing element in said recess having the outer extremity of its honing surface ilush with the 'outer end of said arbor, said `honing elements including pro jecting portions, `an actuating element arranged for rectilinear movement in said recess adjacent said honing element, said actuating element including an inclined cam face for cooperation with the projecting portions of the honing element,

y said inclined cam face being interrupted to pro-4 retarding the initial movement of said hone upon movement of said actuating bar.

8. A grinding arbor for use in grinding dead end holes including a body having alongitudinal recess extending to its outr end, a honing element in said recess having the outer extremity l vide a delay in the hone movement upon initial movement of said actuating element, meansfor securing said honing element against rectilinear movement, and means for securing the yactuating element against radial movement.

11. A wear shoe for hone arbors comprising a channel shaped body, having longitudinally extending marginal edge portions and symmetrical ends, substantially parallel inner walls forming a channel between said edge. portions, cross braces extending across saidchannel and connecting said walls, openings formed in said wear shoe l adapted to receive fasteners, said cr'oss braces and openings being symmetrically spaced with respect to the ends of said wear shoe, whereby said `shoe may be reversibly positioned without changing the .location of the fasteners.

JOSEPH SUNNEN. 

